Antenna selection for opportunistic interference management in MIMO broadcast channels

Opportunistic interference management (OIM) is an approach that can asymptotically achieve dirty paper coding (DPC) capacity in the downlink of wireless cellular networks with minimum feedback requirement. With K antennas at the base station and M mobile users in the cell, the proposed technique requires only K integer numbers related to channel state information (CSI). This multiplexing gain of K is achieved at the expense of M mobile users such that K = Θ(log M). We introduce an antenna selection scheme at the base station to reduce the minimum number of required mobile users significantly at the expense of reasonable increase in feedback.